Expansion-bolt.



J. E. GOEW'EY;

EXPANSION BOLT.

APPLIUATIONTILED .TAN.19. 1911.

Patented J an. 9, 1912.

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JAMES EDWARD GQEWEY, 0F NElVARK, NEW JERSEY.

EXPAN SIGN -BGL'1.

Application filed January 19, 1911.

To all 107mm it concern".

Be it known that I, JAMES EDWARD Gon- WEY, a. citizen .of the United States of America, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a specification.

My invention relates generally to expansion bolts and has particular reference to the construction of anchor bushings for use in connection therewith.

The object of the invention is to obtain parallel or, what amounts practically, to uniform radial expansion of the bushing throughout its entire length, thus increasing the holding pressure or grip upon the bolt and anchoring it more firmly and securely in position.

A device suitable for carrying my invention into effect is illustrated in the accompa-nying drawings. I wish itunderstood, however, that I do not limit myself to the exact form of construction shown, as various changes may be'made therein without departing from the spirit and scope of my invent-ion.

In the drawings: Figure 1 shows my improved anchor bushing in use. Fig. 2 is a view in elevation of the bushing. is a view of the outer end and Fig. 4L is a view of the inner end thereof. .Fig. 5 is a longitudinal section on the line 8'', of Fig.

Fi 6 shows the lnishing in the form of a blank. Fig. 7 shows a slight modification in the construction of the bushing. Fig. 8

, is a View of the outer end and Fig. l) is a View of the inner end of the modified bushing. F i'g. 10 is a cross section on the line s 5 of F i on the line 8.

sents a socket, formed in the usual manner in a wall of stone, brick or cement or the like. Fitted in the socket, there is a soft metal l'mshing 2, provided with a tapererfl bore A screw-bolt is indicated at t, of a form suitable for entering and expanding the bushing suliiciently within the socket to produce the required pressure necessary to anchor the bolt inv position, the thread of the screw cutting its way into the metal oi? the bushing in the usual manner. A bracket or other device is represented at 5, as supported by the bolt.

Specification of Letters IPatent.

Fig. 3

7. Fig. 11 is a similar view s, of Fig. 7 and Fig. l2;showfi the blank of the modified form of bushing.

Referring now to the drawings, 1 repre- Serial No. GQQAZQ.

Expansion bolts, such as are now commonly used, are anchored by expanding the inner .end only of the bushing there being practically no holding pressure or grip exerted by the major portion of the body of the bushing upon the bolt and as a result, there is more or less tendency of the bolt to vibrate and work loose. In order to avoid this objectionable feature, it is the object of the present invention to equalize the holding pressure or grip upon the bolt throughout the entire length of the bushing and this is accomplished by giving the bushing a shape such that the entrance of the screwbolt therein produces a parallel or, in effect, a uniform radial expansion of the bushing from one end to the other.

Ass-shown in the drawings, the bushings, in blank, (see Figs. 6 and 12 are each formed of twin members, which may be rectangular in outline,'as indicated at 6, or triangular, as indicated at 7, such members being shaped and assembled in separated relation, to form a two-part cylinder (see Figs. 2 to 5 and 7 to 11) having a tapered bore and united at one point only, as indicated at 8, at or near the outer or larger end of the bore, by a tie-piece 9. Preferably the tie-piece is given the form of a terminal enlargement, beingfliere shown as an approximately C shaped or split collar 10, the

split or opening 11 in which coincides with the line of separation of the members of the bushing proper, as clearly appears in Figs. 3 and 9. The members of the bushing being thus united at one point only, by a tiepiece having the small cross sectional area of the terminal collar, are maintained in proper relation for all practical purposes and are, at the same time. free to yield readily to the expanding action of the screw-bolt. In thus yielding, a parallel or radial expansion of the bushing members follows and results in the bolt being gripped with equal pressure throiighout the entire length of the bushing and firmly andsecurely held. from vibrating or working loose and rendering the support insecure.

The use, operation and many important advantages of the invention Will be apparentfrom the foregoing description.

Having, therefore, described my tion, I claim:

1. An anchor-bushing for screws, the

invenll atented Jan. $519112.

blank of which has its opposite sides substantially equal and parallel, said blank be ing divided lengthwise into two approxisinooth tapered bore, a member of C-sha'ped mately triangular members shaped and ascross section uniting said cylinder parts at sembled in separated relation to form a twothe larger end of the bore, and a cooperating part cylinder provided with a tapered bore, s ,rew adapted to cut its Way into the ta- 5 a tie-piece uniting the members, and a screw feted bore and produce parallel expansion 15 adapted to enter the bore and expand the of the cylinder parts.

cylinder; JAMES EDWARD GOEWEY. 2. An anchor bushing for screws consist- \Vitnesses; mg of a cylinder of metal divided length- WALTER H. PUMIHREY,

10 wise into two parts, and provided with a M. G. CRAWFORD. 

